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Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light
Jia, HZ (Jia, Hanzhong); Chen, HX (Chen, Hongxia); Nulaji, G (Nulaji, Gulimire); Li, XY (Li, Xiyou); Wang, CY (Wang, Chuanyi); Wang, CY
2015
Source PublicationCHEMOSPHERE
ISSN0045-6535
Volume138Issue:11Pages:266-271
AbstractThe photolysis of polycyclic aromatic hydrocarbons (PAHs) is potentially an important process for its transformation and fate on contaminated soil surfaces. In this study, phenanthrene is employed as a model to explore PAH photodegradation with the assistance of Fe(III)-smectite under visible-light while focusing on roles played by five low-molecular-weight organic acids (LMWOAs), i.e., malic acid, oxalic acid, citric acid, ethylenediaminetetraacetic acid (EDTA), and nitrilotriacetic acid. Our results show that oxalic acid is most effective in promoting the photodegradation of phenanthrene, while only a slight increase in the rate of phenanthrene photodegradation is observed in the presence of malic acid. Electron paramagnetic resonance experiments confirm the formation of (CO2-)-C-center dot radicals in the presence of malic and oxalic acid, which provides strong evidence for generating (OH)-O-center dot and subsequent photoreaction pathways. The presence of EDTA or nitrilotriacetic acid significantly inhibits both Fe(II) formation and phenanthrene photodegradation because these organic anions tend to chelate with Fe(III), leading to decreases in the electron-accepting potential of Fe(III)-smectite and a weakened interaction between phenanthrene and Fe(III)-smectite. These observations provide valuable insights into the transformation and fate of PAHs in the natural soil environment and demonstrate the potential for using some LMWOAs as additives for the remediation of contaminated soil.
KeywordLow-molecular-weight Organic Acids (Lmwoas) Phenanthrene Smectite Visible Light Photodegradation
DOI10.1016/j.chemosphere.2015.05.076
Indexed BySCI
WOS IDWOS:000361772800037
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/4327
Collection环境科学与技术研究室
Corresponding AuthorWang, CY
AffiliationChinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Xinjiang, Peoples R China;Xinjiang Univ, Sch Geol & Min Engn, Urumqi 830046, Peoples R China
Recommended Citation
GB/T 7714
Jia, HZ ,Chen, HX ,Nulaji, G ,et al. Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light[J]. CHEMOSPHERE,2015,138(11):266-271.
APA Jia, HZ ,Chen, HX ,Nulaji, G ,Li, XY ,Wang, CY ,&Wang, CY.(2015).Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light.CHEMOSPHERE,138(11),266-271.
MLA Jia, HZ ,et al."Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light".CHEMOSPHERE 138.11(2015):266-271.
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